FEATURE: basic info route for all sites, even ones that require login

This information is public in meta tags already on home page, providing a
route allows consumers to check it way more cheaply

spec/controllers/site_controller_spec.rb

@@ -0,0 +1,27 @@
+require 'rails_helper'
+
+describe SiteController do
+  describe '.basic_info' do
+
+    it 'is visible always even for sites requiring login' do
+      SiteSetting.login_required = true
+
+      SiteSetting.title = "Hammer Time"
+      SiteSetting.site_description= "A time for Hammer"
+      SiteSetting.logo_url = "/uploads/logo.png"
+      SiteSetting.logo_small_url = "http://boom.com/uploads/logo_small.png"
+      SiteSetting.apple_touch_icon_url = "https://boom.com/apple/logo.png"
+      SiteSetting.mobile_logo_url = "https://a.a/a.png"
+
+      xhr :get, :basic_info
+      json = JSON.parse(response.body)
+
+      expect(json["title"]).to eq("Hammer Time")
+      expect(json["description"]).to eq("A time for Hammer")
+      expect(json["logo_url"]).to eq("http://test.localhost/uploads/logo.png")
+      expect(json["apple_touch_icon_url"]).to eq("https://boom.com/apple/logo.png")
+      expect(json["logo_small_url"]).to eq("http://boom.com/uploads/logo_small.png")
+      expect(json["mobile_logo_url"]).to eq("https://a.a/a.png")
+    end
+  end
+end